The AI seems to be unable to add two numbers together. In the below example the AI decided to spend its turn casting 1 Elvish Mystic, leaving 2 Draconic Roar in hand and 7 lands untapped.

I know the reason the Draconic Roar are not cast is not because the AI is misinterpreting when Dragonlord Ojutai has hexproof as it is more than willing to point Exquisite Firecraft at a tapped Ojutai or Searing Blood an Ojutai that has been hit with Drown in Sorrow. I don't know if this is a bug of some kind or a technical limitation, but an improvement here would boost AI's play performance.